tests: Improve test coverage of py/compile.c.

tests/basics/async_def.py

tests/basics/async_def.py.exp

tests/basics/async_with.py

tests/basics/async_with.py.exp

tests/basics/del_global.py

tests/basics/for_range.py

tests/basics/syntaxerror.py

tests/basics/unpack1.py

tests/cmdline/repl_basic.py

tests/cmdline/repl_basic.py.exp

tests/import/import2a.py

tests/micropython/viper_args.py

tests/misc/non_compliant.py

tests/misc/non_compliant.py.exp

tests/run-tests